Valid email address getting the "invalid" error

Hello -- This is going to sound far more complex than it is, so bear with me... :)

In order to protect my real email address, I use SpamGourmet's service to get & reply to messages. The problem is that in order to reply, I have to use a # in the "to" field, which causes Zoho Mail to claim wrongly that it's invalid. Their site explains it this way:

"Use this address to send a message to example@domain.com label.myusername.code.example#domain.com@ob.0sg.net
that will be from your disposable address label.myusername@spamgourmet.com"

Could you please change things so it's possible to send to addresses like this, as they aren't truly invalid? I really don't want to have to go back to my old email provider every time I need to reply via spamgourmet...

Thank you!

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